孔道结构H3PW12040／TiO2的制备及其可见光光催化降解水溶性染料的性能

采用溶胶一凝胶方法制备了孔道结构复合材料H3PW12040／TiO2，采用ICP-AES，UV／DRS，^31PMAS NMR，TEM和N2吸附等技术对其组成和结构进行了表征．结果表明，催化剂中活性组分H3PW12O40的基本骨架结构未发生改变，H3PW12O40的担载量为22．29％，催化剂平均粒径为40nm，具有双孔结构，其平均微孔和介孔孔径分别为0．6l和3．06nm．考察了催化剂可见光光催化降解6种水溶性染料的性能．结果表明，6种染料均可不同程度地被降解和矿化．通过对染料中性红的光催化降解实验，比较了H3PW12040／TiO2，Degussa P-25和锐钛矿结构Ti02的可见光光催化活性，其中，H3PW12040／TiO2活性最高，且催化剂最易分离，可循环使用．     

Synthesis of Two Novel Rhenium（I） Bipyridyl Photosensitive Dyes

Two novel rhenium(I) 2, 2′-bipyridyl complexes, [(4,4′-di-COOEt-bipy) Re(CO)3 (NCCH3)PF6] and [(4,4′-di-COOEt-bipy) Re (CO)3 (NCS)], a model complex [(4,4′-di-COOEt-bipy) Re (CO)3 (pyridine)PF6], were synthesized. Their ground state electronic spectra and emission spectra were measured in acetonitrile. The MLCT absorption maximum of the complex exhibited a considerable red shift as the ligand changed from pyridine to CNCH3, or SCN.     

Ionic Liquid Based Electrolyte with Mesoporous Silica SBA-15 as Framework for Quasi-solid-state Dye-sensitized Solar Cells

Quasi-solid-state electrolytes were fabricated with mesoporous silica SBA-15 as a framework material. Ionic conductivity measurements revealed that SBA-15 can enhance the conductivity of the quasi-solid-state electrolyte. The diffusion coefficients of polyiodide ions such as Ⅰ3ˉ and Ⅰ5ˉ which were confirmed by Raman spectroscopic measurement, were about twice larger than that of I-. The optimized photoenergy conversion efficiency of dye-sensitized solar cells （DSSC） with the quasi-solid-state electrolyte was 4.3% under AM 1.5 irradiation at 75 mW·cm^-2 light intensity.     

N—乙基—N—苄基苯胺合成方法的改进

以苯胺和乙醇为原料，采用ＲａｎｅｙＮｉ为催化剂，合成了Ｎ－乙基苯胺，再在相转移催化剂作用下，经苄基化反应得到标题化合物，第一步合成方法的收率比通常方法的收率提高约３０％。     

番红花红T与表面活性剂的作用及其在标记DNA中的应用

对阳离子染料番红花红Ｔ（ＳＴ）在阴离子表面活性剂存在时的溶液状态的吸收光谱和荧光光谱进行了研究。结果表明，低浓度阴离子表面活性剂与ＳＴ形成缔合物，导致ＳＴ的吸收与荧光强度降低；增大表面活性剂的浓度，其分子胶束前预聚集促使染料形成非荧光二聚体，导致荧光急剧猝灭，吸收光谱出现新的特征吸收峰；当表面活性剂浓度大于临界胶束浓度（ＣＭＣ）时，染料二聚体离解，ＳＴ单体增溶于胶团中形成新的高量子产率荧光体。本文     

四硫富瓦烯作为染料敏化太阳能电池有机染料电子给体的理论研究(英文)

为了研究四硫富瓦烯(TTF)基团对有机染料敏化剂光电性能的影响,以咔唑染料Dye 1为原型,引入TTF基团作为电子给体,设计了咔唑染料Dye 2.采用密度泛函理论(DFT)和含时密度泛函理论(TD-DFT)分别计算模拟了纯染料分子和吸附团簇(TiO2)9后的形貌、分子轨道能级以及紫外-可见吸收光谱,采用周期性密度泛函理论计算模拟染料分子在二氧化钛(101)面吸附的表面形貌.结果发现:在有机染料中引入TTF基团有助于有机染料敏化剂在二氧化钛表面的抗团聚作用和分子内的电荷转移;最为重要的是,TTF基团的强给电子能力极大地增强了有机染料敏化剂的光捕获能力.所有的计算结果表明,TTF基团是一种非常有潜力改善染料敏化剂光电性能的给电子基团.     

低成本WS_2染料敏化电池对电极的低温制备

采用简单的方法,在低温条件下制作了高效的WS2对电极,并用X射线衍射仪(XRD)、显微共焦拉曼光谱仪(Raman)和扫描电子显微镜(SEM)对材料的物理特性进行了表征.WS_2对电极的电化学催化活性用循环伏安(CV)和光电流密度-电压特性(I-V)来评价.利用所制备WS_2对电极组装的染料敏化太阳能电池的光电转换效率为5.48%略低于Pt对电极(6.6%).研究表明WS_2是一种很有前景的染料敏化太阳能电池Pt对电极替代材料.     

2018年医疗激光系统市场将达20亿美元

本文将对2012~2018年,医疗激光市场(包括CO2激光、准分子激光、Ho∶YAG激光、Nd∶YAG激光、染料激光器、固体激光和气体激光在眼科、皮肤科、泌尿科及心脑血管方面疾病的应用)的全球市场分析、包括市场大小、发展潜力及发展趋势进行预估。2011年,全球医疗激光市场为9.09亿美元,预计在2018年,其全球市场将完成12.5%的增长,达到20亿美元。     

Preparation and study of photoswitchable fluorescence nanoparticles based on spirobenzopyran

The preparation and performance characterization of〈50 nm spirobenzopyran-based photochromic nanocomposites with photoswitchable fluorescence are presented.The nanocomposites were fabricated by means of a modifed miniemulsion polymerization process,in which the hydrophobic spirobenzopyran was covalently attached to the polymer chains and the matched fluorescent dyes were noncovalently embedded in the nanoscale cross-linked polymeric matrix,respectively.The obtained nanocomposites with a high relative fluorescence quantum yield（Q）exhibited superior fluorescent photoswitchable performance due to the effective photo-induced intermolecular energy transfer.The stability of photomerocyanine was also improved.